.After the new technique was introduced the factory produced _______cars in 1994 as the year before.

A．as twice many

B．as many twice

C．twice as many

D．twice as

常用的室内照明灯，如日光灯、白炽灯所用的电源是（）。

A.220V交流电

B.220V直流电

C.380V交流电

D.380V直流电